Dtc P1603: Tcm Trouble Code Detected (For J20 Engine) - Suzuki GRAND VITARA Owner's Manual

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DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
"Precautions For DTC Troubleshooting: ".
Step
1
Was "Engine and Emission Control System Check"
performed?
2
Battery voltage supply circuit check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors
connected.
3) With engine running, measure voltage between "E23-2"
terminal of ECM connector and engine ground.
Is voltage 10 – 14 V?

DTC P1603: TCM Trouble Code Detected (For J20 Engine)

Wiring Diagram
15
14
13
12
11
30
29
28
27
26
44
45
43
42
41
59
60
58
57
56
1. ECM
DTC Detecting Condition
When ECM receives a trouble code from TCM, which indicates that some problem occurred in sensor circuits and its
calculated values used for operations such as idle speed control, engine power control, and so on by TCM, ECM sets
DTC P1603. (TCM outputs the trouble code to ECM when TCM can not compute the engine control signal due to
malfunctions of sensor circuits used for gear shift control.)
Action
2
E92-17
RED
E92-7
WHT
E23
10
9
8
7
6
5
4
3
25
24
23
22
21
20
19
18
40
39 38
37
36
35
34
33
55
54 53
52
51
50
49
48
2. TCM (for A/T model)
Engine General Information and Diagnosis:
Go to Step 2.
Poor "E23-2"
connection or
intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection: in Section
00".
If wire and connections
are OK, substitute a
known-good ECM and
recheck.
WHT/RED
E23-19
WHT/BLU
WHT/BLU
E03-10
WHT/RED
RED
E03-12
WHT
2
1
15
14
13
12
11
17
16
30
29
28
27
26
44
32 31
45
43
42
41
59
47 46
60
58
57
56
Yes
Go to "Engine and
Emission Control
System Check: ".
"DOME" fuse blown,
"WHT" wire is circuit
open or short circuit.
1
E23-4
3
E03-8
E03-6
C37
10
9
8
7
6
5
4
3
25
24
23
22
21
20
19
18
40
39 38
37
36
35
34
33
55
54 53
52
51
50
49
48
3. ABS hydraulic unit / control module assembly
1A-170
No
S5JB0A1104057
2
1
17
16
32 31
47 46
I5JB0A110067-02

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